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La3+掺杂对焦绿石型Bi2O3-ZnO-Nb2O5陶瓷结构和介电性能的影响

DOI: 10.7521/j.issn.0454-5648.2014.06.08

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Abstract:

采用固相反应法制备(Bi1.5LaxZn0.5-x)(Zn0.5+xNb1.5-x)O7(BZNL,x=0.01~0.07mol)焦绿石型陶瓷。利用X射线衍射仪和高阻抗分析仪(LCR)对样品结构、结晶化学特性与介电性能进行表征。结果表明所有陶瓷样品均保持单一的立方焦绿石相;随La3+替代量的增加,陶瓷样品中A位阳离子与8b位O′的平均键长r(O′—A)从0.22836nm增加到0.22846nm;键价和AV(O′)[Bi3La]、AV(O′)[Bi2ZnLa]、AV(O′)[Bi2La2]、AV(O′)[BiZn2La]随之减小;48f位氧的坐标ζ从0.02827nm增加到0.02903nm;样品的介电弛豫峰值温度Tm向低温方向移动,峰值介电常数εm依次减小,当替代量x=0.07mol时,介电弛豫峰值温度Tm降低到最低温度(-107.4℃),峰值介电常数εm为136.35。样品介电弥散性的增强与八面体结构的转变有关。

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